340 
THE SEAWEEDS 
but sometimes nearly bare. Colour dark vinous-red. The favellae are born 
on minute, lateral pedicels, and are solitary or in pairs, surrounded by a 
circle of incurved, involucral ramelli. Tetrasporangia are born on minute, 
lateral, much branched, dichotomous ramelli. Substance rather rigid, 
adheres imperfectly to paper. 
South Australia (Eastern Bays), Tasmania. 
RHODOCALLIS Kiitzing. 
Differs from Euptilota in having a true cortex and bearing the cysto- 
carps terminally on the primary branches. There is only the one species. 
Rhodocallis elegans Kiitzing. 
= Ptilota Rhodocallis Harvey. 
Frond slender, subcompressed, corticated, alternately twice or three times 
compounded ; branches and their divisions subdistant, rod-like, closely 
pectinato-pinnate ; pinnules alternate, subulate, inarticulate; involucre of 
several serrated leaflets; tetrasporangia glomerated near the tips of the 
pinnules. 
Fig. 167 . — Rhodocallis elegans : a, plant; b, a 
branchlet, bearing an involucrate 
favella; c, one of the teeth of the invo- 
lucral leaflet; d, a favella, removed; 
e, a pinnule, bearing a cluster of 
tetraspores; f, a tetraspore; g, longi- 
tudinal section of the frond; h, trans- 
verse section of the frond. (After 
Harvey.) 
